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Connecting a tacho

For all things Electrical.

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Posts: 54
Joined: Mon May 29, 2006 8:59 am
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Connecting a tacho

Post by 410sierra »

Image

In Picture 7 what does wire (C) go to
It really has me stumped Is it of great importance?

Thanks brad
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Post by chimpboy »

Man that takes some real looking at to figure out, but I think it just has everything written twice in diagram 7.

So, wire C is actually the same as "red", both go to +12V from the ignition switch but one says this in writing and the other says it with a shitty picture (of a fuse panel and the ignition switch).

So, I read it as:

A/green -> the coil negative pin.
B/black -> ground.
C/red -> +12V from the ignition.

It seems like someone has added more info to picture 7, to suit a slightly different tacho.

The one they have added info for seems to have an orange wire as well, which (it looks like) is meant to be connected to the dashboard illumination, so it lights up when the dash does (ie so you can read the gauge in the dark).
This is not legal advice.
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Post by 410sierra »

i have installed as it says apart from orange wich i have hooked up to a switch (lights up tacho) .
the only problem now is with the car switched off it sits at about
6500 rpm and as soon as you start it drops down to about 2500 rpm
when the accelerator is applied the needle on the guage goes down in sted of up

Whats wrong :?:
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Post by chimpboy »

Sounds like red and black are around the wrong way maybe.
This is not legal advice.
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Post by Bad JuJu »

I agree with chimpboy.
Posting quality not quantity!

Wanted: Stock HiLux Front Leaf Springs
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Post by 410sierra »

ive tried them both ways makes no differance


it only happens when (C) is connected
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Post by chimpboy »

So you have black to ground, red to +12V, and green to the coil's -ve terminal, and that's all, and it's reading backwards?
This is not legal advice.
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Post by 410sierra »

yes tried it that way still the same
Thanks for the replys
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Post by bilby »

diagram 7 isnt for the voltmeter wiring setup is it ??
just a little left of insanity :)
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Post by 410sierra »

I had a mate say it might be the tacho so i exchanged it for another one.

Installed this one and it works :D just the needle wont go past 1,200

Is it just me :oops:
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Post by Loanrangie »

410sierra wrote:I had a mate say it might be the tacho so i exchanged it for another one.

Installed this one and it works :D just the needle wont go past 1,200

Is it just me :oops:
Maybe your rig cant rev past 1200 ! :D
Saddle up tonto, its the not so loanrangie! . 98 TDI DISCO lightly modded with more to come.
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Post by 410sierra »

Got it all figured out now. :armsup:

Green goes to positive on the coil not the negitive.

Black to negitive not the positve.

The instuctions are incorrect. :bad-words:
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Post by smiley_smoke »

same thing happened to me mate. commander gauge instructions are sh1t as well.
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